Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.

NASCAR relies on drivers to know what they are doing - not depend on switches.-Ed-

After listening to Johnson talking about this, I’m confused about how the “speed trap” on pit road actually works. Does it A) simply measure the car’s speed at each timing point, or B) time the car at each timing point, then do a Speed = Distance/Time calculation to determine the speed between the points? I always thought it was B, but the way these drivers are attempting to “game the system” now is to go like heck between the timing points. Well, that “strategery” would only work if the system measured actual speed at the timing points, or they would have to slow down a lot before they got to the next timing point, to make their average speed between the timing points legal.
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Another thing to remember is, if the pit road speed is 35, NASCAR gives them a 5 MPH buffer, so the real speed limit is 40. Drivers, being racing car drivers after all, don’t set their tachometers to light up at 35, but 40! So there’s no room for the slightest misjudgment.